Hi,
I had this problem myself a few months back.
Try searching for slotcar suppliers and forums. These kind of cars are very often in 1/32 scale and cover a wide variety of car types and scales. The hobby has a very well developed "aftermarket market" (that sounds strange
) and wheels are one of the main items.
I was lookng for some wire wheels for an Aston Martin and found an on-line store in the UK. If I can find the link I will add it later.
Spend an hour searching a couple of slotcar forums though and I am sure it will put you in the right direction (look hard for their search button though
)
HTH